Question 824296
Use the general formula which is based on
the pythagorean theorem:
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If the given points are:
( x1, y1 ) and ( x2, y2 )
then
Distance between the points =  
square root of [ ( x2 - x1 )^2 + ( y2 - y1 )^2 ]
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For your problem:
( x1, y1 ) = ( 2,-4 )
( x2, y2 ) = ( -3,5 )
Distance = {{{ sqrt( ( -3 -2 )^2 + ( 5 -(-4) )^2 ) }}}
Distance = {{{ sqrt( ( -5 )^2 +  9^2 ) }}}
Distance = {{{ sqrt( 25 + 81 ) }}}
Distance = {{{ sqrt( 106 ) }}}
Distance = 10.296